function [ new_data ] = addCorruptedFeatures( data, numFeatures, sigma )

features = data(:,6:end);

idx = randi(size(features,2), [1, numFeatures]);

new_features = features(:, idx);

noisy_new_features = new_features + sigma*randn(size(new_features)); 

new_data = [data noisy_new_features];

end

